Dear Wireshark-users:
Our Nicaraguan non-profit development organization is in the process
of trying to determine a operator panel periodic freeze. This
operator panel receives instructions from a controller. The
operating panel and controller automate the operations of a 930 kW
small hydro plant that provides electricity to a number of rural
towns and villages.
The representative of the control system in Finland indicates that we
should tap directly into the cable that sends data back and forth
between the AC800M controller and the 235 Operator Panel. This is a
special cable that has a female 9-pin RS-232 plug on one end and an
RJ-45 male plug on the other end. A direct serial connection. How
can one capture Modbus traffic or in other words obtain a trace file
from this serial connection?
The control system representative also says that the software must
support "MODBUS" protocol. When you open the Wireshark main page,
and drop-down the HELP menu, there is a part of the HELP that gives a
list of " 911 protocols and packet types supported by Wireshark". On
this list we find "MODBUS/TCP" but not "MODBUS". The representative
from Finland thinks that "MODBUS" is different from "MODBUS/TCP", and
that we need Wireshark to support the "MODBUS" protocol to analyze
the AC800M-to-Operator Panel traffic. Is Modbus/Tcp different from
Modbus and if so can wireshark capture traffic in the Modbus protocol
or possibly translate from one protocol to the other?
Thank you for your help,
Cheers,
Niko
Niko Kozobolidis, P. Eng.
ATDER-BL
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